As describe a while ago by W8NJR, also my TR-7 wouldn't lock onto frequency.
The frequency readout also showed about 17900 Khz
For a while I could correct this problem by re-seating boards.
However this problem came back.
Measurement showed that the PTO-voltage at pin 6/38 of the translator board
My TR-7 is back in line and working again. Thanks to all for the suggestions
and especially to K4OAH. I followed Garey's instructions first and that did
the trick. Thanks again for the help.
Terry, W8NJR
In a message dated
: [Drakelist] TR-7 Frequency Problem
My TR-7 has developed a frequency problem. When turned on with the bandswitch
on 160m, the frequency readout showed a frequency of 17600-17800 Khz and was
jittery. After warmup of a half hour or so, it would start working and and show
1870 Khz like it should
Terry -
This display is an indication that the Lo Synthesizer (Bands up through
14 MHz) is unlocked.
Do NOT touch the +10V adjustment pot (last one of a row of pots across
the top of the power supply card), just behind the front panel on the
right side. Changing this pot at all requires a
Terry -
Didn't mention it before, but of course also remove the top metal shield
over the rest of the card cage and reseat the cards under there as
well. There are two small screws through the rear panel into the shield
that must be removed, the rest of the screws can be loosened a couple of
Garey Barrell wrote:
Terry -
This display is an indication that the Lo Synthesizer (Bands up through
14 MHz) is unlocked.
Yep, I've had the exact same problem and Garey is right on the money
with a cure. In fact after about 2 years my rig has developed the same
problem and I have to do
On Mon, 08 Dec 2008 10:50:09 -0500, Garey Barrell wrote:
You can make a puller by bending a piece of wire coat-hanger
into a squared U shape with small bends at the open end of the U to
mate with these holes.
Instructions on how to make the card puller from the venerable wire
coathanger can
On Mon, 08 Dec 2008 08:11:35 -0800, GrampZ wrote:
Yep, I've had the exact same problem and Garey is right on the money
with a cure. In fact after about 2 years my rig has developed the same
problem and I have to do this again.
I stumbled on the fix myself the first time when recalling my
Jim Shorney wrote:
On Mon, 08 Dec 2008 08:11:35 -0800, GrampZ wrote:
Yep, I've had the exact same problem and Garey is right on the money
with a cure. In fact after about 2 years my rig has developed the same
problem and I have to do this again.
I stumbled on the fix myself the first
On Mon, 08 Dec 2008 12:23:34 -0500, Garey Barrell wrote:
One other problem of this nature is the solder on the long pins of the
DR-7. There is quite a bit of stress on these soft-soldered
connections, and they are subject to the solder cracking. This is not
always visible so reflowing these
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